if a line is equally inclined to axes ,prove that its slope is +_1

The inclination of the line with x and y axes be α & β
respectively.

If the line is equally inclined with the axes, then α=βα+β=2α±90°=2α  angle between the axes is ±90°±45°=α
Now,
Slope = tanα=tan±45°=±1

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